Imagine you are a genetic counselor and a couple (Martin and Shelley) comes to you for information. Martin has a sibling with sickle cell anemia, but neither he nor his parents have the disease. Shelley was married once before and did have a male child with sickle cell anemia. She does not have the disease herself. (sickle cell anemia is an autosomal, recessive disease)
What is the probability that their unborn baby will have sickle cell anemia?
